*51%*:**Student difficulties with quantum states while translating state vectors in Dirac notation to wave functions in position and momentum representations***44%*:**Changes in students’ problem-solving strategies in a course that includes context-rich, multifaceted problems***42%*:**Assessment of Student Problem Solving Processes***41%*:**Categorization of quantum mechanics problems by professors and students***41%*:**Examination of Students’ Self-monitoring in Problem Solving***40%*:**Strong preference among graduate student teaching assistants for problems that are broken into parts for their students overshadows development of self-reliance in problem-solving***40%*:**Student evaluation of more or better experimental data in classical and quantum mechanics***40%*:**Students' choices when solving expectation value problems***38%*:**Student Difficulties with Quantum Mechanics Formalism***38%*:**Enhancing Cognitive Development through Physics Problem Solving: A Taxonomy of Introductory Physics Problems***38%*:**Towards an Understanding of How Students Use Representations In Physics Problem Solving***38%*:**Effect of Problem Solutions on Students' Reasoning Patterns on Conceptual Physics Problems***37%*:**Student Difficulties in Understanding Probability in Quantum Mechanics***37%*:**Synthesis problems: role of mathematical complexity in students' problem solving strategies***36%*:**Student difficulties in learning quantum mechanics***36%*:**The General Assessment of Problem Solving Processes and Metacognition in Physics Education***36%*:**Students' dynamic geometric reasoning about quantum spin-1/2 states***36%*:**Examining the productiveness of student resources in a problem-solving interview***35%*:**An Overview of Physics Education Research on Problem Solving**